[Sbs_gems] [New Logentry] Calibration of Binary gas analyzer used for the GEM detectors in Hall A

[cleung at jlab.org]

Logentry Text:
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Yesterday, Ibrahim and I tried to calibrate the two binary gas analyzers. 
It should be noted that only the SBS gas system is in used, and the SBS BGA reading of the gas mixture is ~76.5%. And the BB system was not in used. 

We first connected both SBS and BB BGAs in series, then connected a bottle of 75/25 ArCO2 premix to the BGAs. After a few hours, the reading of both BGAs stabilized at ~78.5%. Note that the BB BGA took a bit longer to stabilized, presumably due to dust, as the BB BGA has not seen any gas flow for some time. 

Today we connected the BGAs to a 70/30 ArCO2 premix. The both BGA read ~74%. Using these values, and assuming no uncertainties in the premix, the SBS MFC is set to produce a ~73% ArCO2 mixture.

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This is a plain text email for clients that cannot display HTML.  The full logentry can be found online at https://logbooks.jlab.org/entry/4321854
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